Jean molas



No. 608,064. Patented lulv 26, I898.

- J. MDLAS. I

VALVE FDR ENGINES.

(Application fiXed Dec. 31, 1897.) (N0 Mod el.)

A H \x WW 7.

l'lED nrnr FFICEt JEAN MOLAS, OF LONDON, ENGLAND.

SPECIFICATION formingpart of Letters Patent No. 608,064, dated July 26, 1898.

Application filed December 31, 1897. .serial No. 664,924. (No model.) Patented in England March 21, 1896, No. 6,324, and in France April 22, 1897.1T0. 266,223.

To all whom it may concern.-

Be it known that I, JEAN MOLAS, a citizen of France, residing at 247 High road, Queen Annes avenue, South Tottenham, London, in the county of Middlesex, England, have invented a certain new and useful Improvement in Valves for Engines WVorked by Oompressed Air or other Gaseous Fluids, of which the following is a specification, and for which Ihave obtained patents in Great Britain ,dated March 21, 1896, No. 6,324, and in'France, dated April 22, 1897, No. 266,223.

My invention relates to a simple construction of engine worked by compressed air or other gaseous fluid. The cylinder, of which there may be several, is single-acting and is fitted with a plunger connected in the usual way to a crank. At the side of the cylinder, near its end, there is an" inlet-valve opening outward and having its stem with a rounded end projecting a little intothe cylinder, so that as the plunger is approaching the end of itsinstroke its end, which is alittle rounded, acting on the valve-stem, opens the valve for a moment, admitting a charge of high-pressure fluid,which propels the plunger outward. At the end of the cylinder there is also an exhaust-valve urged by a spring to open inward. 'When by expansion the pressure inthe cylinder is so far reduced that the spring can overcome it, the exhaust-valve opens, allowing the fluid to escape, and thereupon the plunger makes its instroke until it again opens the supply-valve, admitting a fresh charge, the pressure of which closes the exhaust-valve and again propels the plunger. A second cylinder may be placed in line with the first, the two together constituting a double-acting cylinder having an elongated plunger common to both, the middle of which is connected by side rods to a pair of cranks.

Figure 1 of the accompanying drawings is a side view of a double-acting engine according to my invention. Fig. 2 is an enlarged View, partly in elevation and partly in section, of the double-acting cylinder. Fig. 3 shows in part longitudinal section a modified arrangement of the valves, and Fig. eshows a modification according to which the engine can be used as an air-compressing pump.

As shown in Figs. 1 and 2, two cylinders A in line with one another are fitted with a long plunger 13, through the middle of which passes a cross-pin 0, extending through slots in the sides of the junction-piece D of the two cylinders A and connected by side rods to cranks E. The inlet-valve F for compressed air has a stem with a rounded end projecting slightly into the cylinderA in such a position that when the plunger B reaches the end of its stroke its slightly-rounded end striking the end of the valve-stem causes the valve to open for an instant, admitting a charge of compressed air into the cylinder. This expands, propelling the plunger until the pressure in the cylinder is so far reduced that the exhaust-valve G, urged by an adjustable spring, opens, allowing the contents of the cylinder to escape while the plunger makes its back stroke, on the completion of which the action is repeated.

As shown in Fig. 3, both the inlet-valve F and the outlet-valve G are arranged in the axial line of the cylinder A. In this case the stem of F is struck by a screw f, adjusted in the end of the plungerB. In both arrangements of valves shown in Figs. 2 and 3 a bent spring 1) on the end of the plunger B serves to insure the closing of the exhaust-valve G before the inlet-valve F is opened.

By working the crank E by any suitable power the engine can be employed as an aircompressing pump, but for this purpose, as shown in Fig. 4:, the screw f for opening the valve F is dispensed with, and the spring which acts on the valve G is arranged so as to tend to keep the valve closed instead of tending to open it. The plunger as it makes its stroke draws in air by the valve G and, compressing it, forces it by the valve F to a suitable reservoir.

Having thus described thenature of this invention and the best means I know of carrying the same into practical effect, I claim An engine worked by compressed air, or other gaseous fluid, having its inlet cradmission valve positively opened by contact name to this specification, in the presence of with a part of the piston or plunger at the eX- two subscribing witnesses, this 21st day of IO treme of its instroke, and a positively-closed December, A. D. 1897.

exhaust-Valve opened by a. sprin when the 5 pressure of the Working fluid in the cylinder JEAN MOLAS' is sufliciently reduced by expansion, substan- WVitnesses: tially as described. JNO. P. M. MILLARD,

In testimony whereof I have signed my I W. M. HARRIS. 

